CVE-2024-39506

Summary

In the Linux kernel, the following vulnerability has been resolved:

liquidio: Adjust a NULL pointer handling path in lio_vf_rep_copy_packet

In lio_vf_rep_copy_packet() pg_info->page is compared to a NULL value, but then it is unconditionally passed to skb_add_rx_frag() which looks strange and could lead to null pointer dereference.

lio_vf_rep_copy_packet() call trace looks like: octeon_droq_process_packets octeon_droq_fast_process_packets octeon_droq_dispatch_pkt octeon_create_recv_info …search in the dispatch_list… ->disp_fn(rdisp->rinfo, …) lio_vf_rep_pkt_recv(struct octeon_recv_info *recv_info, …) In this path there is no code which sets pg_info->page to NULL. So this check looks unneeded and doesn't solve potential problem. But I guess the author had reason to add a check and I have no such card and can't do real test. In addition, the code in the function liquidio_push_packet() in liquidio/lio_core.c does exactly the same.

Based on this, I consider the most acceptable compromise solution to adjust this issue by moving skb_add_rx_frag() into conditional scope.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux1f233f327913f3dee0602cba9c64df1903772b55 < 87d6bdc006f0cbf297a3b2ad6e40ede4c3ee5dc2affected
LinuxLinux1f233f327913f3dee0602cba9c64df1903772b55 < dcc7440f32c7a26b067aff6e7d931ec593024a79affected
LinuxLinux1f233f327913f3dee0602cba9c64df1903772b55 < cbf18d8128a753cb632bef39470d19befd9c7347affected
LinuxLinux1f233f327913f3dee0602cba9c64df1903772b55 < a86490a3712cc513113440a606a0e77130abd47caffected
LinuxLinux1f233f327913f3dee0602cba9c64df1903772b55 < f1ab15a09492a5ae8ab1e2c35ba2cf9e150d25eeaffected
LinuxLinux1f233f327913f3dee0602cba9c64df1903772b55 < fd2b613bc4c508e55c1221c6595bb889812a4feaaffected
LinuxLinux1f233f327913f3dee0602cba9c64df1903772b55 < a6f4d0ec170a46b5f453cacf55dff5989b42bbfaaffected
LinuxLinux1f233f327913f3dee0602cba9c64df1903772b55 < c44711b78608c98a3e6b49ce91678cd0917d5349affected
LinuxLinux4.15affected
LinuxLinux0 < 4.15unaffected
LinuxLinux4.19.317 <= 4.19.*unaffected
LinuxLinux5.4.279 <= 5.4.*unaffected
LinuxLinux5.10.221 <= 5.10.*unaffected
LinuxLinux5.15.162 <= 5.15.*unaffected
LinuxLinux6.1.95 <= 6.1.*unaffected
LinuxLinux6.6.35 <= 6.6.*unaffected
LinuxLinux6.9.6 <= 6.9.*unaffected
LinuxLinux6.10 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References